从java发送hashmap以响应本机 [英] Sending hashmap from java to react native
本文介绍了从java发送hashmap以响应本机的处理方法,对大家解决问题具有一定的参考价值,需要的朋友们下面随着小编来一起学习吧!
问题描述
我有一个包含地图<字符串、列表<自定义对象>= new ConcurrentHashMap<>();
I have a hashmap that contains Map<String, List<Custom_object> = new ConcurrentHashMap<>();
数据被归档到这个地图中,我需要发送更新的地图数据来反应原生 JS 桥.我怎样才能达到同样的目标?
The data gets filed in this map, and I need to send the updated map data to react native JS bridge. How can I achieve the same?
提前致谢,湿婆
推荐答案
我通常将自定义对象转换为 json 字符串,然后将其解析为 writableMap 并返回如下所示.
I usually convert my Custom Object to json String then I parse it to writableMap and return it like below.
@ReactMethod
public void yourBridgeMethod(final ReadableMap argument, final Promise promise) {
try {
Object x = getMapCustom;
final Gson gson = new Gson();
final String response = gson.toJson(x);
WritableMap returnMap = this.util.convertJsonToMap(new JSONObject(response));
promise.resolve(returnMap);
} catch (JSONException e) {
promise.reject("401", e.getLocalizedMessage());
}
}
您可以使用此方法创建一个 util 类来处理您的转换
You could create a util class with this methods to handle your conversions
public WritableMap convertJsonToMap(JSONObject jsonObject) throws JSONException {
WritableMap map = new WritableNativeMap();
Iterator<String> iterator = jsonObject.keys();
while (iterator.hasNext()) {
String key = iterator.next();
Object value = jsonObject.get(key);
if (value instanceof JSONObject) {
map.putMap(key, convertJsonToMap((JSONObject) value));
} else if (value instanceof JSONArray) {
map.putArray(key, convertJsonToArray((JSONArray) value));
if (("option_values").equals(key)) {
map.putArray("options", convertJsonToArray((JSONArray) value));
}
} else if (value instanceof Boolean) {
map.putBoolean(key, (Boolean) value);
} else if (value instanceof Integer) {
map.putInt(key, (Integer) value);
} else if (value instanceof Double) {
map.putDouble(key, (Double) value);
} else if (value instanceof String) {
map.putString(key, (String) value);
} else {
map.putString(key, value.toString());
}
}
return map;
}
public WritableArray convertJsonToArray(JSONArray jsonArray) throws JSONException {
WritableArray array = new WritableNativeArray();
for (int i = 0; i < jsonArray.length(); i++) {
Object value = jsonArray.get(i);
if (value instanceof JSONObject) {
array.pushMap(this.convertJsonToMap((JSONObject) value));
} else if (value instanceof JSONArray) {
array.pushArray(convertJsonToArray((JSONArray) value));
} else if (value instanceof Boolean) {
array.pushBoolean((Boolean) value);
} else if (value instanceof Integer) {
array.pushInt((Integer) value);
} else if (value instanceof Double) {
array.pushDouble((Double) value);
} else if (value instanceof String) {
array.pushString((String) value);
} else {
array.pushString(value.toString());
}
}
return array;
}
public JSONObject convertMapToJson(ReadableMap readableMap) throws JSONException {
JSONObject object = new JSONObject();
ReadableMapKeySetIterator iterator = readableMap.keySetIterator();
while (iterator.hasNextKey()) {
String key = iterator.nextKey();
switch (readableMap.getType(key)) {
case Null:
object.put(key, JSONObject.NULL);
break;
case Boolean:
object.put(key, readableMap.getBoolean(key));
break;
case Number:
object.put(key, readableMap.getDouble(key));
break;
case String:
object.put(key, readableMap.getString(key));
break;
case Map:
object.put(key, convertMapToJson(readableMap.getMap(key)));
break;
case Array:
object.put(key, convertArrayToJson(readableMap.getArray(key)));
break;
}
}
return object;
}
public JSONArray convertArrayToJson(ReadableArray readableArray) throws JSONException {
JSONArray array = new JSONArray();
for (int i = 0; i < readableArray.size(); i++) {
switch (readableArray.getType(i)) {
case Null:
break;
case Boolean:
array.put(readableArray.getBoolean(i));
break;
case Number:
array.put(readableArray.getDouble(i));
break;
case String:
array.put(readableArray.getString(i));
break;
case Map:
array.put(convertMapToJson(readableArray.getMap(i)));
break;
case Array:
array.put(convertArrayToJson(readableArray.getArray(i)));
break;
}
}
return array;
}
这篇关于从java发送hashmap以响应本机的文章就介绍到这了,希望我们推荐的答案对大家有所帮助,也希望大家多多支持IT屋!
查看全文